Mitsubishi Electric MSC-GE-VB Service Manual page 5

1-2. DRY ( ) OPERATION
Set temperature is as shown on the right chart.
The system for dry operation uses the same refrigerant circuit as the
cooling circuit.
The compressor and the indoor fan are controlled by the room tem-
perature.
By such controls, indoor flow amounts will be reduced in order to
lower humidity without much room temperature decrease.
DRY operation will not work when the room temperature is 13°C or
below.
1. Thermostat control (MSC-GE20/25/35VB)
Thermostat turns ON or OFF by the difference between room temperature and set temperature.
Room temperature minus set temperature : 0.3°C or more ·············································· ON
Room temperature minus set temperature : less than -0.3°C ··········································· OFF
2. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto fan speed becomes Low.
3. The operation of the compressor and indoor/outdoor fan
Compressor operates by room temperature control and time control.
Set temperature is controlled to fall 2°C from initial room temperature.
Indoor fan and outdoor fan operate in the same cycle as the compressor.
● When the room temperature is 23°C or over:
When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
● When the room temperature is under 23°C.
When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
Operation time chart
Example
When the room temperature is 23°C or over:
OFF
Thermostat
OFF
Indoor fan
OFF
Outdoor fan
Compressor
4. Coil frost prevention
• The operation is the same as coil frost prevention during COOL mode.
• The indoor fan operates at the set speed and the compressor does not operate for 5 minutes because the coil frost pre-
vention has priority.
1-3. HEAT ( ) OPERATION (MSC-GE20/25/35VB, MSH-GD80VB, MSH-GE50VB)
1. Thermostat control (MSC-GE20/25/35VB)
Thermostat turns ON or OFF by the difference between room temperature and set temperature.
Room temperature minus set temperature : less than -0.3°C ············································· ON
Room temperature minus set temperature : 0.3°C or more ················································ OFF
Initial temperature difference
ON
ON
ON
OFF
ON
ON
OFF
3
minutes
8 minutes
Initial temperature difference
Set temperature and
initial room temperature in DRY mode
35
30
25
20
15
10
10 15
Initial room temperature
OFF
ON
OFF
ON
OFF
4 1
minutes minute
5
20 25 30 35
Difference between room
temperature and set tem-
perature during operation
Set temperature
Thermostat
°C
-0.3
ON
Difference between room
temperature and set tem-
perature during operation
Set temperature
Thermostat
°
-0.3 C
°C
0.3
0.3°C